How to track the value of target function during ortools mixed-integer-programming solving process?

Question

I'm using ortools SCIP to solve a really large mixed-integer-programming problem.

solver = pywraplp.Solver_CreateSolver('SCIP')

"""
Problem Definition Is Omitted Here
"""

solver.Minimize(target_function)

status = solver.Solve()

That problem costs more than 30 minutes.

The SCIP uses branch-cut-and-price to solve the mixed-integer-programming problem.

Each time, the SCIP would cut some branches.

So, my question is, how to print the value of the target function, after each cut(after each iteration)?

Laurent Perron · Accepted Answer · 2024-02-23 19:36:29Z

0

Looks like a SCIP question and not an OR-Tools one.

So how would you do it with the SCIP binary or library.

If you know how to do this, I believe there are no mechanism in OR-Tools linear solver wrappers to support that, but maybe there is a parameter to display that kind of info. In that case, you should be able to set it directly through the API.

edited Feb 23, 2024 at 19:36

answered Feb 23, 2024 at 15:02

Laurent Perron

11.2k1 gold badge10 silver badges27 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Ben Yan Over a year ago

Thanks for reply, I'm using python ortools library to use SCIP

Laurent Perron Over a year ago

Yes but it only offers a subset of what Scip library do. Is what you ask even feasible with the Scip api?

Матвей Зехов · Accepted Answer · 2025-03-31 14:37:49Z

0

Just use

solver.EnableOutput()

That will enable verbosity of solver.

answered Mar 31 at 14:37

Матвей Зехов

212 bronze badges

Collectives™ on Stack Overflow

How to track the value of target function during ortools mixed-integer-programming solving process?

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related